CVE-2026-74355 (GCVE-0-2026-74355)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
Title
iommu/vt-d: Fix RB-tree corruption in probe error path
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix RB-tree corruption in probe error path The info->node RB-tree member is zero-initialized via kzalloc. If a device does not support ATS, the device_rbtree_insert() call is skipped. If a subsequent probe step fails, the error path jumps to device_rbtree_remove(), which misinterprets the zeroed node as a tree root and corrupts the device RB-tree. Fix this by explicitly initializing the RB-node as empty using RB_CLEAR_NODE() during initialization and guarding the removal with RB_EMPTY_NODE().
Severity
8.2 (High)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 , < f5102e0fc3c6dc8685549891a96e4589fdb3e211 (git)
Affected: 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 , < d16923a45d4d08367650fdc3451c89299ab6ac5a (git)
Affected: 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 , < 43bd9e6d5513cb1edbafdeef146a1edc3aaced56 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/intel/iommu.c"
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "semver"
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              "versionType": "semver"
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix RB-tree corruption in probe error path\n\nThe info-\u003enode RB-tree member is zero-initialized via kzalloc. If\na device does not support ATS, the device_rbtree_insert() call is\nskipped. If a subsequent probe step fails, the error path jumps to\ndevice_rbtree_remove(), which misinterprets the zeroed node as\na tree root and corrupts the device RB-tree.\n\nFix this by explicitly initializing the RB-node as empty using\nRB_CLEAR_NODE() during initialization and guarding the removal with\nRB_EMPTY_NODE()."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is hit in intel_iommu_probe_device() during IOMMU device probing on the PCI bus notifier path (BUS_NOTIFY_ADD_DEVICE), which is only reachable via local kernel actions such as PCI hotplug/rescan, SR-IOV VF creation, or driver bind\u2014not via any network protocol.\nAC:L - A privileged attacker can reliably trigger the fault path by inducing PASID table allocation failure (e.g., memory pressure) while adding or reprobing a non-ATS PCI function on a VT-d scalable-mode host where ATS-capable devices may already populate the IOMMU device RB-tree.\nPR:H - Reaching intel_iommu_probe_device() requires adding or reprobing PCI/IOMMU devices through kernel-local administration (CAP_SYS_ADMIN for sysfs rescan/SR-IOV, or equivalent host control); this cannot be done from an unprivileged user or user namespace alone.\nUI:N - Exploitation does not depend on any victim user action beyond the attacker (or administrator) initiating device probe/hotplug; no interactive user steps are required once the privileged trigger is performed.\nS:C - Corrupting the Intel VT-d device RB-tree breaks RID-to-device tracking used for IOMMU page-request and invalidation handling, which can undermine DMA/IOMMU isolation boundaries (e.g., SR-IOV/assigned-device or host DMA containment), not just the probing process itself.\nC:H - Calling rb_erase() on a zero-initialized RB-node can null the tree root and corrupt kernel RB-tree pointers; such kernel memory corruption is exploitable to obtain arbitrary read primitives or leak sensitive kernel data during subsequent lookups.\nI:H - The erroneous rb_erase() performs out-of-tree pointer writes that corrupt IOMMU device tracking structures, providing a kernel memory corruption primitive that can be developed into arbitrary write or code execution.\nA:H - RB-tree corruption in the IOMMU device map can cause kernel oopses/panics during later device_rbtree_find() operations in interrupt-driven VT-d page-request or invalidation-timeout paths, resulting in complete loss of kernel availability."
            }
          ]
        }
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        "dateUpdated": "2026-08-17T05:46:16.092Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/f5102e0fc3c6dc8685549891a96e4589fdb3e211"
        },
        {
          "url": "https://git.kernel.org/stable/c/d16923a45d4d08367650fdc3451c89299ab6ac5a"
        },
        {
          "url": "https://git.kernel.org/stable/c/43bd9e6d5513cb1edbafdeef146a1edc3aaced56"
        }
      ],
      "title": "iommu/vt-d: Fix RB-tree corruption in probe error path",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74355",
    "datePublished": "2026-08-15T05:58:40.766Z",
    "dateReserved": "2026-08-15T05:44:03.887Z",
    "dateUpdated": "2026-08-17T05:46:16.092Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix RB-tree corruption in probe error path\n\nThe info-\u003enode RB-tree member is zero-initialized via kzalloc. If\na device does not support ATS, the device_rbtree_insert() call is\nskipped. If a subsequent probe step fails, the error path jumps to\ndevice_rbtree_remove(), which misinterprets the zeroed node as\na tree root and corrupts the device RB-tree.\n\nFix this by explicitly initializing the RB-node as empty using\nRB_CLEAR_NODE() during initialization and guarding the removal with\nRB_EMPTY_NODE()."
          }
        ],
        "id": "CVE-2026-74355",
        "lastModified": "2026-08-17T06:19:30.180",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T06:22:36.887",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-08-19T12:44:39+00:00",
      "cve": "CVE-2026-74355",
      "id": "CVE-2026-74355",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/vt-d: Fix RB-tree corruption in probe error path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74355.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:06:54Z",
      "cve": "CVE-2026-74355",
      "id": "CVE-2026-74355",
      "initial_release_date": "2026-09-03T00:06:54Z",
      "product_status:known_not_affected": "362",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74355",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74355.json",
      "version": "2"
    }
  }
}



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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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